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Hanna Marine Alkalinity Checker (dKH)

Hanna Marine Alkalinity Checker (dKH)

Regular price $99.00
Regular price Sale price $99.00
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The Hanna Marine Alkalinity (dKH) Checker® bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light sensing detector to precisely determine absorbance and ion concentration. This level of instrumentation also offers greater resolution and accuracy, but can cost hundreds of dollars. The Hanna Marine Alkalinity Checker® measures alkalinity in dKH units, using a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.



The HI772 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure alkalinity in degrees of calcium hardness, commonly abbreviated as dKH. Critical to marine environments, alkalinity not only provides the carbonate ion required for calcium carbonate skeletal regeneration of coral reefs, but it also acts as a pH buffer against large changes in acidity. Designed as a more accurate alternative to chemical test kits, the HI772 provides quick, accurate results in four easy steps.

  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Small size, big convenience
  • Ideal for: Aquaculture & Aquariums, Water Quality
  • Alkalinity, Seawater

    Seawater Alkalinity Range 0.0 to 20.0 dKH
    Seawater Alkalinity Resolution 0.1 dKH
    Seawater Alkalinity Accuracy ±0.3 dKH or ±5% of reading, whichever is greater
    Seawater Alkalinity Method colorimetric method.

    General Meter

    Automatic Shut-Off after ten minutes of non-use
    Battery Type/Life (1) 1.5V AAA
    Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
    Dimensions 86.0 mm x 61.0 mm x 37.5 mm (3.4" x 2.4" x 1.5")
    Weight 64 g (2.25 oz.)
    Photometer/Colorimeter Light Source LED @ 610 nm
    Photometer/Colorimeter Light Detector silicon photocell
    Ordering Information HI772 Checker® is supplied with (2) sample cuvettes with caps, alkalinity reagent starter kit for 25 tests (1 bottle of alkalinity reagent), (1) 1 ml syringe and tip, ­­­ battery, instructions, and quick start guide.

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